You know how sometimes when you're perusing Facebook, you see a status update along the lines of "Missing girl! Repost this on your wall now!" and you just ignore it and go on to like a photo of someone's shoes? Yeah, don't do that. An abandoned 4-year-old was just identified, thanks in big part to social media and people who heeded the ever-present "repost" message.

Zoe Brown, AKA "Little Jane Doe", was abandoned on a doorstep recently in South Carolina. Roy Campbell heard his doorbell ring, and when he went out front to see who it was, he found Zoe sitting in a stroller with a note attached to her diaper that read "Call DFAC" (Division of Family and Child Services). The little girl was identified when a tip came in to authorities after nearly two million people reposted her photo to their Facebook wall. She's currently in foster care, awaiting notice of a potential family member who may be able to provide a safe environment for her, and her parents -- Alonzo Brown and Tongela Denise McBride -- have been arrested and charged with unlawful neglect of a child.

So, yeah. Although a lot of things on Facebook and Twitter are completely idiotic and banal, some things aren't -- and this is when social media becomes completely awesome, as opposed to a mere time suck! I mean, make no mistake, photos of puppies are fantastic, but social media as a means to help solve a crime? That's tremendous. And that trumps LOLcats any day.

So the next time you see one of those chain-like messages in your news feed, imploring you to help someone out you've never met, just do it. It takes two seconds and what have you got to lose? Two million people obliged this time and look what happened.

Do you usually repost "chain-letter" type of things to your Facebook page?